How Can I Efficiently Use Dapper's IN Clause with IEnumerable Values?

Querying Database with IN Clause Using Dapper ORM and IEnumerable Values

Querying a database with an IN clause is a common operation, and when using Dapper ORM, there's an efficient way to write these queries when the values for the IN clause come from business logic.

Instead of manually concatenating the values into a comma-separated string, Dapper allows you to pass an IEnumerable of values as a parameter directly. For example, given the query:

SELECT * 
  FROM SomeTable 
 WHERE id IN (commaSeparatedListOfIDs)

Where commaSeparatedListOfIDs is an IEnumerable of integers, you can construct the query using Dapper as follows:

string sql = "SELECT * FROM SomeTable WHERE id IN @ids";
var results = conn.Query(sql, new { ids = new[] { 1, 2, 3, 4, 5 }});

Dapper will automatically generate the appropriate SQL from the IN clause and bind the values from the ids parameter. Note that if you are using PostgreSQL, a slightly different approach is required. Refer to the provided answer for details.

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